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cra'nial nerve"

Anat.any of the nerves arising from the brainstem and exiting to the periphery of the head through skull openings, including 10 pairs in fish and amphibians and 12 pairs in reptiles, birds, and mammals: in humans, these are the abducens nerve, accessory nerve, auditory nerve, facial nerve, glossopharyngeal nerve, hypoglossal nerve, oculomotor nerve, olfactory nerve, optic nerve, trigeminal nerve, trochlear nerve, and vagus nerve.